content/renderer/pepper/pepper_media_stream_track_host_base.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "content/renderer/pepper/pepper_media_stream_track_host_base.h"
   6
   7 #include "base/logging.h"
   8 #include "base/numerics/safe_math.h"
   9 #include "content/public/renderer/render_thread.h"
  10 #include "content/public/renderer/renderer_ppapi_host.h"
  11 #include "ppapi/c/pp_errors.h"
  12 #include "ppapi/host/dispatch_host_message.h"
  13 #include "ppapi/host/host_message_context.h"
  14 #include "ppapi/host/ppapi_host.h"
  15 #include "ppapi/proxy/ppapi_messages.h"
  16 #include "ppapi/shared_impl/media_stream_buffer.h"
  17
  18 using ppapi::host::HostMessageContext;
  19 using ppapi::proxy::SerializedHandle;
  20
  21 namespace content {
  22
  23 PepperMediaStreamTrackHostBase::PepperMediaStreamTrackHostBase(
  24     RendererPpapiHost* host,
  25     PP_Instance instance,
  26     PP_Resource resource)
  27     : ResourceHost(host->GetPpapiHost(), instance, resource),
  28       host_(host),
  29       buffer_manager_(this) {}
  30
  31 PepperMediaStreamTrackHostBase::~PepperMediaStreamTrackHostBase() {}
  32
  33 bool PepperMediaStreamTrackHostBase::InitBuffers(int32_t number_of_buffers,
  34                                                  int32_t buffer_size,
  35                                                  TrackType track_type) {
  36   DCHECK_GT(number_of_buffers, 0);
  37   DCHECK_GT(buffer_size,
  38             static_cast<int32_t>(sizeof(ppapi::MediaStreamBuffer::Header)));
  39   // Make each buffer 4 byte aligned.
  40   base::CheckedNumeric<int32_t> buffer_size_aligned = buffer_size;
  41   // TODO(amistry): "buffer size" might not == "buffer stride", in the same way
  42   // that width != stride in an image buffer.
  43   buffer_size_aligned += (4 - buffer_size % 4);
  44
  45   // TODO(penghuang): |HostAllocateSharedMemoryBuffer| uses sync IPC. We should
  46   // avoid it.
  47   base::CheckedNumeric<int32_t> size = number_of_buffers * buffer_size_aligned;
  48   if (!size.IsValid())
  49     return false;
  50
  51   content::RenderThread* render_thread = content::RenderThread::Get();
  52   scoped_ptr<base::SharedMemory> shm(
  53       render_thread->HostAllocateSharedMemoryBuffer(size.ValueOrDie()).Pass());
  54   if (!shm)
  55     return false;
  56
  57   base::SharedMemoryHandle shm_handle = shm->handle();
  58   if (!buffer_manager_.SetBuffers(number_of_buffers,
  59                                   buffer_size_aligned.ValueOrDie(),
  60                                   shm.Pass(),
  61                                   true)) {
  62     return false;
  63   }
  64
  65   base::PlatformFile platform_file =
  66 #if defined(OS_WIN)
  67       shm_handle;
  68 #elif defined(OS_POSIX)
  69       shm_handle.fd;
  70 #else
  71 #error Not implemented.
  72 #endif
  73   SerializedHandle handle(host_->ShareHandleWithRemote(platform_file, false),
  74                           size.ValueOrDie());
  75   bool readonly = (track_type == kRead);
  76   host()->SendUnsolicitedReplyWithHandles(
  77       pp_resource(),
  78       PpapiPluginMsg_MediaStreamTrack_InitBuffers(
  79           number_of_buffers,
  80           buffer_size_aligned.ValueOrDie(),
  81           readonly),
  82       std::vector<SerializedHandle>(1, handle));
  83   return true;
  84 }
  85
  86 void PepperMediaStreamTrackHostBase::SendEnqueueBufferMessageToPlugin(
  87     int32_t index) {
  88   DCHECK_GE(index, 0);
  89   DCHECK_LT(index, buffer_manager_.number_of_buffers());
  90   host()->SendUnsolicitedReply(
  91       pp_resource(), PpapiPluginMsg_MediaStreamTrack_EnqueueBuffer(index));
  92 }
  93
  94 void PepperMediaStreamTrackHostBase::SendEnqueueBuffersMessageToPlugin(
  95     const std::vector<int32_t>& indices) {
  96   DCHECK_GE(indices.size(), 0U);
  97   host()->SendUnsolicitedReply(pp_resource(),
  98       PpapiPluginMsg_MediaStreamTrack_EnqueueBuffers(indices));
  99 }
 100
 101 int32_t PepperMediaStreamTrackHostBase::OnResourceMessageReceived(
 102     const IPC::Message& msg,
 103     HostMessageContext* context) {
 104   PPAPI_BEGIN_MESSAGE_MAP(PepperMediaStreamTrackHostBase, msg)
 105     PPAPI_DISPATCH_HOST_RESOURCE_CALL(
 106         PpapiHostMsg_MediaStreamTrack_EnqueueBuffer, OnHostMsgEnqueueBuffer)
 107     PPAPI_DISPATCH_HOST_RESOURCE_CALL_0(PpapiHostMsg_MediaStreamTrack_Close,
 108                                         OnHostMsgClose)
 109   PPAPI_END_MESSAGE_MAP()
 110   return ppapi::host::ResourceHost::OnResourceMessageReceived(msg, context);
 111 }
 112
 113 int32_t PepperMediaStreamTrackHostBase::OnHostMsgEnqueueBuffer(
 114     HostMessageContext* context,
 115     int32_t index) {
 116   buffer_manager_.EnqueueBuffer(index);
 117   return PP_OK;
 118 }
 119
 120 int32_t PepperMediaStreamTrackHostBase::OnHostMsgClose(
 121     HostMessageContext* context) {
 122   OnClose();
 123   return PP_OK;
 124 }
 125
 126 }  // namespace content